2
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6 Installation & Operation
MN427
WARNING:
Incorrect motor rotation direction can cause serious or fatal injury or equipment damage. Be sure
to verify motor rotation direction.
WARNING:
Guards must be installed for rotating parts such external fans, and unused shaft extensions,
should be permanently guarded to prevent accidental contact by personnel. Accidental contact
with body parts or clothing can cause serious or fatal injury.
First Time Start Up and Operation
WARNING:
Mechanically lock or tie down the fan during servicing to prevent rotation as voltage will be
produced even when the PM motor is totally disconnected from the power source.
1. Be sure that all power to motor and accessories is off.
3. Inspect all electrical connections for proper termination, clearance, mechanical strength and electrical
continuity.
4. Install the motor conduit box cover and all covers and panels that were removed during installation.
5. Remove the mechanical lock or tie down from the fan to allow the fan to turn freely.
6. Refer to MN776 Section 5 and follow the Pre
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Operation and Power up Procedures to complete the
installation and start up procedure.
During operation observe the motors’ performance. It should run smoothly with little noise. The bearings
should not overheat and should reach a normal operating temperature. Any undue noise, overheating, or
erratic performance should be investigated and corrective action taken immediately to prevent serious
damage.
All RPM AC motors are lubricated before shipment and will operate for a long period before regreasing is
required. The period will vary depending on environmental and service conditions.
Refer to Maintenance section of this manual.
Air Flow Cooling
RPM AC cooling tower motors are rated based upon cooling tower air flow over the motor and ambient air
temperature as shown on the motor nameplate. Motors are TEAO (totally enclosed air over) with air flow
generated from the fan mounted to the motor shaft.
Maximum Safe Speed
The maximum safe operating speed of the motor is listed on the motor nameplate. Do not exceed this
speed. When the maximum speed of the motor control can exceed the maximum safe motor speed
(motor nameplate value), the speed characteristics of the control must be set so the speed is limited to
this maximum. For cooling tower applications, the motor base speed is the maximum speed.
Balance
Motors are dynamically balanced to meet the dynamic balance limits of NEMA MG1 Part 7 second for
peak value of the unfiltered velocity in inches per second unless ordered differently. Balance is done with
a full length 1/2 height shaft key. A full shaft key is shipped with motor.
Table 2
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3 Dynamic Balance
RPM
NEMA
IEC
Velocity Peak (in/sec)
Velocity Peak (mm/sec RMS)
0-600
0.15
2.7
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